AngersZhuuuu opened a new pull request #29500:
URL: https://github.com/apache/spark/pull/29500
### What changes were proposed in this pull request?
Hive no serde mode when column less then output specified column, it will
pad null value to it, spark should do this also.
```
hive> SELECT TRANSFORM(a, b)
> ROW FORMAT DELIMITED
> FIELDS TERMINATED BY '|'
> LINES TERMINATED BY '\n'
> NULL DEFINED AS 'NULL'
> USING 'cat' as (a string, b string, c string, d string)
> ROW FORMAT DELIMITED
> FIELDS TERMINATED BY '|'
> LINES TERMINATED BY '\n'
> NULL DEFINED AS 'NULL'
> FROM (
> select 1 as a, 2 as b
> ) tmp ;
OK
1 2 NULL NULL
Time taken: 24.626 seconds, Fetched: 1 row(s)
```
### Why are the changes needed?
Keep save behavior with hive data.
### Does this PR introduce _any_ user-facing change?
No
### How was this patch tested?
Added UT
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